Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4df8544e30ac452…

MALICIOUS

PDF

105.8 KB Created: 2021-06-27 21:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e0c09c24017cbbad9ce7fdd652e26353 SHA-1: 51e3f2e7cf8997d1cd2d7396446ee818b8629284 SHA-256: d4df8544e30ac452dd50dea78051fc214c847268e0b3f80f03034e83ae22fcc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to obscure the true destination or purpose. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=2019+top+hits PDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ms3lj7i9vgajrqi353ejs6u031/vegugafoge.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/6m1s032d474fub4rp7kiuh6mdd/makuzilebomuwajore.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/09bd58128825972c5cf795251eeeb583/8218990308.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/b4tass67om1erj4kid5iehg913/89941780407.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/3932480a88907b4d6316245e63d37f80/dodadawi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a330b1313b3---28098722740.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd717802a9---37074591623.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075527dc27f3---goragibunalexamijibug.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/tonasuwok.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/15617472550.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609799c4101bd---tusedogolew.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j3seql63mp165q4okp79oi65ok/fukufulitoris.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16084814218251---83239228999.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/uprfc7c84l5t44vj5d454428b7/22568476795.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/59864455449.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e6cef3e2---62906283546.pdfIn PDF document text
    • https://isleo.com/i_photos/file/subidivo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vopuwoxinurobitaw.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/guvasejutejibev.pdfIn PDF document text
    • https://lesura.net/userfiles/file/pewetemij.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/2bdb5258cb24ea6b5fef3b55612c3d82/35620716261.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6fb15696---nexemolorafamoxibizomiva.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160866c537e896---nuwenuranetidifufosi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/02fad4e0be6bf25b9617e5d76e074aaf/13459641658.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 10172 bytes
SHA-256: bc56bf3766b263c016d91c5fd2546f317b3f7323c4d65841b02dd2b2a9f10c4e
font_01_sfnt_off000153d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE9 17652 bytes
SHA-256: 2c91017df369b3379a9014fdf422b30aa336e13788208c01d0bd2a8735f5807b

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